JPS62219724A - Power line carrier equipment - Google Patents

Abstract

PURPOSE:To attain sure data communication by allowing a master station to send a power control data to a slave station together with a polling address in response to the change in the load of power line or the change in noise environment, communicating the data with a minimum power when the load noise is small and increasing the power as required accordingly. CONSTITUTION:The master station A designates the minimum power by a control code to a slave station B at first in the initial state and awaits the reply from the slave station and when no reply comes, the master station increases the power by one stage and sends a 1-stage power-up command control code to the slave station in this state and awaits the reply from the slave station again. The operation above is repeated sequentially up to the maximum 4-stage until the reply of the slave station is received by power-up and if no reply comes yet from the slave station even with up to the maximum 4-stage power-up, it is regarded as a fault and the master station increments an error counter by '1' to apply the error data processing and the slave station is transferred to a slave station C. The similar operation is applied sequentially up to a slave station N for the communication. Thus, the efficient power line carrier communication is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a general transmission coupling technology to a power line in a power line carrier device that transmits data using a power line.

(b) Conventional technology There is a power line carrier device that uses a pulse drive method as a drive circuit that frequency-modulates data and couples it to the power line.

(c) Problems to be solved by the invention In devices that transmit data using power lines, the load connected to the power line naturally changes depending on the time of day, and the noise environment can also change widely. In such cases, the condition of carrier communication may deteriorate or communication may become impossible, and there has been a demand for measures to improve this situation.

(d) Means for Solving the Problems In order to solve the problems mentioned above, the present invention aims to solve the above-mentioned problems.When the load connected to the power line or the noise environment changes widely, the master station transmits the power control data along with the boring address. to the slave station,
When the noise load is small, communication is performed at the minimum power, and when the transport condition deteriorates and communication becomes difficult, the power is increased sequentially as necessary to ensure reliable communication.

(E) Operation FIG. 1 is a block diagram of the slave station of the present invention. If the load on the power line or the noise environment does not change significantly, the drive pulse generating circuit (1) can be implemented with a configuration as shown in FIG. 3 (10). According to the present invention, when the power line load fluctuates or the noise environment changes widely, the drive pulse generation circuit (1) is implemented as shown in FIG. 2 (100). In Figure 1, (2) is a waveform shaping circuit, (3) is a drive circuit, (4) is a primary parallel tuning circuit, (5) is a secondary series tuning circuit, (6) is a power line, and (7) is a receiving circuit. FIG. 2 shows the details of (1) the drive pulse generation circuit of the present invention.

In the drive pulse generation circuit (100) in FIG. 2, (101) is an analog switch, and (102) is a two-circuit analog switch controlled by a reception data latch circuit.

(102) The received data latch circuit is a circuit that controls the two circuits of the analog switch (101) using the control code received from the master station (A) in the receiving circuit (7) of FIG. 1, and latches its state. 2-circuit analog switch (10
1) causes the Schmitt trigger (103) input (
D Differential circuit R, C (7) R””Rs, R1/R
2, R+/R3, RI/R! /Rs (7)
The four-stage IC is switched to adjust the pulse width of FIGS. 4(C) and (d), thereby increasing or decreasing the power of the drive circuit of FIG. 1(3). FIG. 4 shows the voltage waveforms at each point in FIG. 1 (a) to (e), and (C1) to (el) show how the carrier waveform changes when the power is increased and the pulse width changes.

(F) Example In the initial state of the present invention, the master station (A) first communicates with the slave station (
For B), specify low power using a control code and wait for a response from the slave station. If there is no response, the master station performs one-step power-up, and in this state transmits a one-step power-up command control code to the slave station and waits for a response from the slave station again. This operation is sequentially repeated until the power is increased to the fourth highest level and a slave station response is received. If there is no response from the slave station even after powering up to the highest level, the 4th stage, it is assumed that there is an abnormality, and the master station processes the abnormal data by incrementing the error counter (not shown) by 1, and then the next slave station (
Move on to C). Thereafter, similar operations are performed sequentially up to (N) to perform communication.

(g) Effects of the invention In a frequency modulation type power line carrier device that transmits data using a power line, stable carrier communication is possible even when there is a change in the power line load or noise environment, and the master station (
At the beginning of polling from A), always start with the minimum power,
Normally, the response is about 90%, so carrier communication can be carried out with the minimum power and minimum radiation, and as necessary, the power is increased sequentially from the minimum power, so it can be controlled in the optimum state and with minimal impact on other equipment, making it an efficient power line. Transport communication became possible.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a slave station of the power line carrier device of the present invention. FIG. 2 is a detailed diagram of the drive pulse generation circuit. Figure 3 is another drive pulse generation circuit, Figure 4 is °1
Waveform diagram of each point in the figure. Figure 5 is a block diagram of the entire system. (1)... Drive pulse generation circuit (2)...
...Waveform shaping circuit (3) ...Drive circuit (4) ...Primary parallel tuning circuit (5) ...Secondary series tuning circuit (6) ...Power line (7) ...Reception circuit (10) ...Drive pulse generation circuit (11)
・・・ ・・・ Shimi・Soto Tori
G (12)...NOR gate (13)...NAND gate (100)...Drive pulse generation circuit (10
1)...Analog switch (102)...
...Receive data latch circuit (103) ...
Shumi, Soto Triga AND) (104)...N Sumika Gate (105)...NAND Gate (a) to (e)
and (cl) ~(e')... Each point and its waveform diagram (A)... Master station (B), (C) ~ (N)... Child Office Patent Applicant
Takemoto Electric Instrument Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] Frequency modulation type power line carrier equipment that transmits data using power lines, and uses a pulse drive type drive circuit to frequency modulate the data and connect the power lines. Accordingly, the master station sends power control data along with the boring address to the slave station, communicates with the minimum power when the load noise is small, and establishes reliable data communication by sequentially increasing the power as necessary. Features of power line transport equipment.